Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 806 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🧺 Do we need a paper clip for the yeast balloon? (a) not needed (b) needed
2. 2.🧺 Which of these is not needed for the yeast balloon? (a) a mirror (b) warm water (c) a small bottle (d) sugar
3. 3.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of water is kept the same. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) sunlight (b) time (c) sugar (d) warm water
5. 5.🔍 Which is the odd one out? (a) time (b) sugar (c) salt (d) warm water
6. 6.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
7. 7.🧺 Which of these is not needed for the yeast balloon? (a) dry yeast (b) a magnet (c) a small bottle (d) warm water
8. 8.True or false: vinegar is something yeast needs. (a) True (b) False
9. 9.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) warm water (c) a paper clip (d) a balloon
10. 10.🍞 Why does yeast work slowly in cold water? (a) cold slows yeast down (b) cold makes it pink (c) cold water is heavy (d) cold kills sugar
11. 11.🛟 After the yeast experiment, what should you do with the mixture? (a) throw it at a wall (b) keep it for a month (c) put it in your mouth (d) pour it down the sink
12. 12.🍞 Does yeast need a magnet to make gas? (a) yeast needs it (b) yeast does not need it
13. 13.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a balloon (d) a comb
14. 14.🔍 Which is the odd one out? (a) warm water (b) a magnet (c) vinegar (d) salt
15. 15.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is kept the same. (a) True (b) False
16. 16.🍞 Which of these is something yeast needs? (a) salt (b) time (c) sunlight (d) vinegar
17. 17.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) dry yeast (b) sugar (c) a small bottle (d) a battery cell
18. 18.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) air from outside (d) carbon dioxide gas
19. 19.True or false: sugar is something yeast does not need. (a) True (b) False
20. 20.True or false: salt is something yeast needs. (a) True (b) False
21. 21.True or false: warm water is something yeast needs. (a) False (b) True
22. 22.True or false: sunlight is something yeast needs. (a) False (b) True
23. 23.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a battery cell (c) a balloon (d) a paper clip
24. 24.🍞 Which of these is something yeast does not need? (a) salt (b) warm water (c) time (d) sugar
25. 25.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we keep it the same (b) we change it (c) we measure it
26. 26.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the same bottles is kept the same. (a) False (b) True
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) the water temperature (b) the amount of yeast (c) size of the balloon
28. 28.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of yeast (b) size of the balloon (c) the water temperature (d) the same bottles
29. 29.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it turns to bread (c) it shrinks to nothing (d) the balloon is smaller
30. 30.🍞 Where is yeast used in the kitchen? (a) to colour rice (b) to clean floors (c) to wash dishes (d) to make bread rise
31. 31.🧺 Which of these is not needed for the yeast balloon? (a) a balloon (b) a small bottle (c) sugar (d) a comb
32. 32.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
33. 33.🧺 Do we need sugar for the yeast balloon? (a) needed (b) not needed
34. 34.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it
35. 35.🔮 Predict: you leave out the sugar. What happens to the balloon? (a) it bursts at once (b) it grows much faster (c) it grows very little (d) it turns yellow
36. 36.True or false: vinegar is something yeast does not need. (a) False (b) True
37. 37.🛟 The water for the yeast should be ___. (a) boiling hot (b) warm, not hot (c) very salty (d) ice cold
38. 38.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a mirror (c) a magnet (d) a small bottle
39. 39.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the amount of yeast is the one thing we change. (a) True (b) False
40. 40.🍞 Does yeast need vinegar to make gas? (a) yeast needs it (b) yeast does not need it

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